.advance-tree__row {
    display: flex;
}

.advance-tree__row__tool {
    flex-shrink: 0;
    padding: 0 5px;
    visibility: hidden;
}

.advance-tree__row__tool a+a {
    margin-left: 5px;
}

.advance-tree__row:hover .advance-tree__row__tool{
    visibility: visible;
}